please excuse this very amateur question but i want to start a small backyard garden this year...i dont want a raised garden...how do i kill all the grass before tilling? (or is that done after?) A few years ago i tried and we just tilled and didn't do anything to kill grass b/c I didn't know any better and thought it would all just dry up and wouldn't grow back but it did within a couple weeks. Dumb I know but now i really want to do this b/c i want to know where at least some of my family's food is coming from, and just sick of all the scary recalls on spinach etc...